        /* 登录界面 */
        a{
            /* 取消超链接下划线 */
            text-transform: uppercase;
        }
        .form-box {
            position: relative;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            height: 400px;
            width: 300px;
            background: rgba(255, 255, 255, .5);
            /* 背景模糊渲染 */
            backdrop-filter: blur(5px);
        }

        .form-box .form-text {
            font-size: 30px;
            color: #fff;
            text-shadow: 1px 1px 1px #000;
            margin-bottom: 20px;
            /* 文字间距 */
            letter-spacing: 10px;
            /* 字母大写 */
            text-transform: uppercase;
        }

        .form-box input {
            width: 200px;
            height: 24px;
            margin-bottom: 20px;
            font-size: 16px;
            background: transparent;
            border: none;
            /* 光标悬浮时,出现的边框去掉 */
            outline: none;
            border-bottom: 1px solid;
        }

        .form-box .btn {
            width: 200px;
            height: 30px;
            font-size: 16px;
            letter-spacing: 5px;
            text-align: center;
            border: none !important;
            outline: none;
            background: #fff;
            box-shadow: 1px 1px 1px rgb(221, 218, 218);
            font-weight: bold;
            margin: 15px auto 20px;
            cursor: pointer;
        }

        .form-box .btn:active {
            background: rgb(224, 198, 198);
        }

        .form-box span a {
            color: rgb(230, 28, 28);
        }
